Method of providing cured coating films free of popping defects

Abstract

A method for providing cured coating films free of popping defects. The method requires the application to a substrate of at least 2.0 mils/50.8 microns of a uncured curable coating composition comprising an anti-popping component (a), a film-forming component (b), and a crosslinking component (c), wherein anti-popping component (a) has from 12 to 72 carbon atoms, is substantially free of any heteroatoms, is not a crystalline solid at room temperature and comprises a mixture of two or more structures selected from the group consisting of aliphatic structures for anti-popping component (a), aromatic-containing structures for anti-popping component (a), cycloaliphatic-containing structures for anti-popping component (a), and mixtures thereof, at least one of the two or more structures being a cycloaliphatic-containing structure or an aromatic-containing structure. The coated uncured substrate is cured to provide a cured film free of popping defects with an average film build of at least 2.0 mils/50.8 microns.

1. A method of making a cured coating film having an average film build of at least 2.0 mils/50.8 microns which is substantially free of popping defects, comprising applying a curable coating composition to a substrate to form a coated uncured substrate having an average film build of at least 2.0 mils/50.8 microns, the curable coating composition comprising an anti-popping component (a), a film-forming component (b), and a crosslinking component (c), wherein anti-popping component (a) has from 12 to 72 carbon atoms, is substantially free of any heteroatoms, is not a crystalline solid at room temperature and comprises a mixture of two or more structures selected from the group consisting of aliphatic structures for anti-popping component (a), aromatic-containing structures for anti-popping component (a), cycloaliphatic-containing structures for anti-popping component (a), and mixtures thereof, wherein at least one of the two or more structures is either a cycloaliphatic-containing structure or an aromatic-containing structure,
 subjecting the coated uncured substrate to conditions sufficient to form a continuous cured coating film having an average film build of at least 2.0 mils/50.8 microns and which is substantially free of popping defects, 
 
       wherein the anti-popping component (a) comprises a least two functional groups reactive with one or both of film-forming component (b) and crosslinking component (c). 
     
     
       2. The method of  claim 1  wherein the reaction between anti-popping component (a) and one or both of film-forming component (b) and crosslinking component (c) results in thermally irreversible linkages. 
     
     
       3. The method of  claim 1  wherein the curable coating composition is a waterbome coating composition.